CVE-2021-39221

    Dashboard / Vulnerabilities / CVE-2021-39221

    CVE-2021-39221

    Published: 25 Oct 2021Last Modified: 9 Jul 2026

    Summary:

    Details: Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.

    References: https://github.com/nextcloud/contacts/pull/2407, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j6cx-mxqf-f9vc

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ca6b1e05e25534e6d7eba80d4dce6a215ec06053

    Affected versions

    v4.0.2
    v4.0.0
    v4.0.0-rc.0
    v4.0.0-beta.3
    v4.0.0-beta.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-39221 | CVE-DB